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Long Ledge No. 2 Long Ledge Group

Past Producer in Fresno county in California, United States with commodity Chromium
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Public Land Survey System information
  6. Commodities
  7. Materials information
  8. Host and associated rocks
  9. Nearby scientific data
  10. Ore body information
  11. Economic information about the deposit and operations
  12. Mining district
  13. Production statistics
  14. Links to other databases
  15. Bibliographic references
  16. Reporter information

Geologic information

Identification information

Deposit ID 10043677
MRDS ID M100575
Record type Site
Current site name Long Ledge No. 2 Long Ledge Group
Alternate or previous names Pearson Property, Riverview Mine

Geographic coordinates

Geographic coordinates: -119.29235, 36.87384 (WGS84)
Location accuracy 1000(meters)
Relative position Assumed Spot Sect. 19

Site location context

Political divisions (FIPS codes)

Fresno(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Pine Flat Dam(quadrangle 1:24,000 scale)

Fresno(quadrangle 1:100,000 scale)

Fresno(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper King(hydrologic unit)

Tulare-Buena Vista Lakes(hydrologic accounting unit)

Tulare-Buena Vista Lakes(hydrologic subregion)

California(hydrologic region)

Federal lands

Sierra National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State County
United States California Fresno

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 012S 024E 19 California

Commodities

Commodity Importance
Chromium Critical Primary

Materials information

Materials Type of material
Chromite Ore

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Granitoid > Granite
  • Host or associated Host
    Rock type Metamorphic Rock > Serpentinite

Nearby scientific data

(1) -119.29235, 36.87384
ListMap

Economic information

Ore body information

  • General form LENSES

Comments on the geologic information

  • THE CHROMITE DEPOSITS OF WATTS VALLEY OCCUR ON THE EASTERN LIMB OF A SYNCLINAL, NE PLUNGING ULTRAMAFIC SILL. THE EASTERN LIMB, KNOWN AS HOG MTN, IS A LITTLE OVER A MILE WIDE, WHILE THE WESTERN LIMB, WHICH FORMS RED MTN, AVERAGES 3 MILES WIDE. THE TWO LIMBS JOIN TO THE NW AND TOGETHER FORM A DISCONTINUOUS TRIANGULAR EXPOSURE OF PERIDOTITE 10 MILES LONG AND 8 MILES WIDE ACROSS THE BASE.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No

Mining district

District name Watts Valley Area

Production statistics

  • Year 1917
    Material ORE
    Accuracy Estimate
    Description Ap_Grade: ^40% Cr2o3
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Cr2O3 Chromium Chromium 40wt-pct

Comments on the workings information

  • WORKINGS CONSISTED OF AN OPEN CUT, A 50 FT LONG ADIT TRENDING S60E, THEN EAST FOR 10 FT, AND A WINZE 35 FT DEEP AT END OF ADIT.

Reference information

Bibliographic references

  • Deposit

    CDMG BULL 134, P. 9

  • Production

    CDMG BULL 134, P. 193.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUL-80 Oster, Karel L. (Albers, John P.) U.S. Geological Survey

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Maps centered on this site

Authoritative California resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.